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Process for machining marine gear

A marine gear and processing technology, applied in the field of gear processing, can solve the problems of low hardness, insufficient toughness, and low motion accuracy, and achieve the effects of good toughness, elimination of residual stress, and not easy to break

Active Publication Date: 2014-11-05
杭州浙西机械有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The invention provides a processing technology for high-power marine gears with high motion precision, high load, high surface hardness and good toughness; it solves the problem of low hardness, insufficient toughness and low motion precision of processed gears in the prior art technical issues

Method used

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  • Process for machining marine gear
  • Process for machining marine gear

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Embodiment

[0015] A marine gear processing technology. First, 20GrMnTi is used as a raw material for forging. The thickness of the forged workpiece is 5cm. Then, the forged workpiece is heated to 420°C, kept for 5 hours and cooled in the furnace. Then carry out turning processing, drill a hole in the center of the workpiece, hob the outer peripheral surface of the workpiece, and process the spline in the center hole. The approximate shape of the workpiece after machining has been completed, and then carburized, the workpiece is sealed in carbon powder, and the temperature is raised to 700~850°C under a negative pressure of 800 Pa, and the thickness of the carburized layer is guaranteed to be 1.2~1.8mm , keep warm for 2-3 hours, spread for 15 minutes after turning on the furnace, add 20°C normal temperature oil, cool and quench, and keep at 200°C for 2-3 hours after cooling for stress relief treatment. After cooling and quenching, perform secondary high-temperature oil treatment, and plac...

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Abstract

The invention relates to a method for machining a gear, in particular to a process for machining a marine gear which is high in power and toughness. The process for machining the marine gear includes the steps of firstly, blanking for forging to obtain a cylindrical blank; secondly, normalizing the blank, and turning to drill a central hole; thirdly, hobbing outside the cylindrical blank by a hobbing machine; fourthly, performing carburization to an obtained workpiece; fifthly, cooling and quenching after carburization; sixthly, performing secondary high-temperature oil treatment to eliminate stress; and seventhly, machining the workpiece to form the marine gear. The process for the high-power marine gear which is high in movement precision, high in load, high in surface hardness and high in toughness is provided. The technical problem that a gear machined in the prior art is low in hardness, poor in toughness and low in movement precision is solved.

Description

technical field [0001] The invention relates to a gear processing method, in particular to a high-power and high-toughness marine gear processing technology. Background technique [0002] The traditional processing process of gears: blanking (casting, forging) → normalizing (quenching and tempering) → gold processing (gear hobbing and gear shaping process) → high-frequency quenching. Although the manufacturing cost of this type of gear is low, it is mainly limited by the traditional processing technology: it can not use higher quality materials, the surface hardness is low (≤HRC45-52), and heat treatment is the final process, the deformation after quenching It cannot be eliminated, the surface roughness is always ≤0.8, and the tensile strength of the tooth core is generally ≥420Mpa. The manufacturing accuracy and motion accuracy are both ≤8-8-8GB10095-88. Obviously, this type of transmission gear is limited to applications where the speed is not high, the load is relatively...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/14
Inventor 李珍珠
Owner 杭州浙西机械有限公司
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